All dogs are going to -- keep in mind that all dogs are of different temperaments and different sizes and shapes. As I show you the hand strokes that you will use, you can modify those hand strokes and the pressure that you use to match your dog size and sensitivity level. This has been the introduction to how to massage your dog, and in the next sequence we will go over the basics of canine massage.
Some studies have shown that your deep sleep should at least be 20% of your overall sleep. It means that since most adults need 8-9 hours of sleep, they will need about 1.6-1.8 hours of deep sleep to feel fully functional next day.
In adults, total sleep time, sleep efficiency, percentage of slow-wave sleep, and percentage of REM sleep significantly decrease with age, while light sleep and wake after sleep onset increased with age. The decline in deep sleep begins around age 36-50. However, it is important to note that these changes are less prominent among women and in the healthiest older adults. In summary, sleep duration as well as structure changes with age and reflects alterations in physiology and health.